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Forum: Pentax SLR Lens Discussion
11-27-2012, 12:17 PM
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Be careful with old flashes, many have a high trigger voltage that will damage a modern camera. You can check it with a simple multimeter, just between the ground on the side and the center pin. Pentax never gave an official answer on the voltage, since they don't want to be responsible if an old non-Pentax flash fries your camera. Some say up to 24 volts is fine, I like to stay safe at around 12 volts.
I don't see your particular model listed here, but some of the others seem to be safe so there is a chance yours will be fine.
Photo Strobe Trigger Voltages |
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Forum: Pentax SLR Lens Discussion
11-27-2012, 11:59 AM
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Since I have very few A lenses, I don't have a P-TTL flash at the moment, I just have a couple old Vivitar 285HVs and a Yongnuo YN-560. I believe that the Vivitar/Tumax should work well as an on camera flash, however it doesn't support more advanced features like HSS or wireless P-TTL. It has some manual controls, so it could be used off camera with a radio trigger. Right now the Metz flashes are the best value for your money, they support all advanced features and the firmware is easily updateable by the user so when a new body, like the K30, you don't have to send it back to be updated. You'll spend more on a Metz than the Vivitar, but it is a better flash.
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Forum: Pentax SLR Lens Discussion
11-27-2012, 10:04 AM
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It isn't just a secondary flash, the pop up flash and any hotshoe flash in P-TTL mode will just fire at full power every time with an M lens. To use flash with an M lens you either need to use the manual power settings on the flash or have one that has its own sensor for auto mode.
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Forum: Pentax SLR Lens Discussion
11-27-2012, 09:05 AM
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Optically they are the same, the big difference is that the A series can meter in all modes on a DSLR, the M series is stop down metering in M mode only. So for convenience, you really are better off with an A series over an M.
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